A wire harness includes a conductive path configured to electrically connect between high-voltage devices. The conductive path includes a main line and a branch line that branches from the main line. An overcurrent cut-off portion is disposed on a way of the branch line to cut off an overcurrent.
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1. A wire harness comprising:
a conductive path, configured to electrically connect between high-voltage devices, comprising:
a main line; and
a branch line that branches from the main line; and
an overcurrent cut-off portion disposed on a way of the branch line to cut off an overcurrent;
a first insulating and waterproofing portion that is provided for a branch connection portion and performs electrical insulating function and waterproof function to an exterior of the branch connection portion;
a second insulating and waterproofing portion that is provided for the overcurrent cut-off portion and performs electrical insulating function and waterproof function to the overcurrent cut-off portion;
a first electromagnetic shielding member that covers the first insulating and waterproofing portion to shield the first insulating and waterproofing portion;
a second electromagnetic shielding member that covers the second insulating and waterproofing portion to shield the second insulating and waterproofing portion; and
a protector that receives the first and second insulating and waterproofing portions respectively covered with the first and second electromagnetic shielding members,
wherein the branch connection portion is provided on an electric connection part where the branch line is electrically connected to the main line.
2. The wire harness according to
3. The wire harness according to
4. The wire harness according to
a first body portion extending in a first direction and configured to receive the first insulating and waterproofing portion such that the main line extends inside the first body portion in the first direction; and
a second body portion extending in a second direction, different from the first direction, and configured to receive the second insulating and waterproofing portion such that the branch line extends inside the second body in the second direction.
5. The wire harness according to
an insulating box body configured to receive the overcurrent cut-off portion through an opening of the insulating box body; and
a cover configured to cover the opening of the insulating box body.
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This application is based on Japanese Patent Application (No. 2016-033981) filed on Feb. 25, 2016, the contents of which are incorporated herein by reference.
The present invention relates to a wire harness provided with a conductive path to establish electric connection between high-voltage devices.
For example, a wire harness disclosed in JP-A-2014-42443 has been known as a background-art wire harness for establishing electric connection between high-voltage devices (accessories) mounted on a hybrid car or an electric car. The wire harness has a configuration including one or plural conductive paths, a packing member for receiving and protecting the conductive paths, an external connection unit disposed at a harness terminal to establish connection with an external high-voltage device, and plural fixation members for fixedly attaching the wire harness to a fixation target.
In the aforementioned related-art wire harness, the devices (accessories) to be connected include an inverter unit in an engine room and a battery in a car rear portion. The present inventor has wanted the wire harness to establish electric connection with another new device (accessory) in addition to those two devices. To this end, the inventor examined a structure in which a conductive path is extended from an engine-room-side harness terminal of the wire harness to the new device. However, the wire harness has to be wired to make the conductive path turn back. Thus, there is a problem that working may be complicated. In addition, the conductive path cannot be always extended from the harness terminal to the new device at the shortest distance. Thus, there is another problem that the length of the conductive path turning back is increased accordingly, to thereby increase the cost. Further, there is another problem that when there is necessity to prevent an overcurrent from flowing into the new device, the structure of the background-art wire harness cannot satisfy the necessity.
The present invention has been developed in consideration of the aforementioned situation. An object of the invention is to provide a wire harness capable of improving workability in connection with devices and reducing the cost, and capable of preventing an overcurrent from flowing.
In order to attain the foregoing object, a wire harness according to a first aspect of the invention is a wire harness including: a conductive path configured to electrically connect between high-voltage devices, wherein the conductive path includes a main line and a branch line that branches from the main line; and wherein an overcurrent cut-off portion is disposed on a way of the branch line to cut off an overcurrent.
According to a second aspect of the invention, the wire harness according to the first aspect further includes insulating and waterproofing portions that are provided for respectively corresponding to a branch connection portion and the overcurrent cut-off portion and conduct insulating function and waterproof function to the branch connection portion and the overcurrent cut-off portion, wherein the branch connection portion is provided on an electric connection part where the branch line is electrically connected to the main line.
According to a third aspect of the invention, the wire harness according to the second aspect further includes shielding members that cover the insulating and waterproofing portions respectively to shield the insulating and waterproofing portions.
According to a fourth aspect of the invention, the wire harness according to the third aspect further includes a protector that receives the insulating and waterproofing portions covered with the shielding members.
According to the above aspects of the invention, a wire harness has a structure in which a conductive path is used as a main line, a branch line is connected to the middle of the conductive line serving as the main line, and an overcurrent cut-off portion is disposed in a middle of the branch line. The insulating and waterproofing portions are provided in a connection part (branch connection portion) between the conductive path serving as the main line and the branch line, and the overcurrent cut-off portion respectively. Thus, the branch connection portion and the overcurrent cut-off portion are insulated and waterproofed. There is no problem about branching in spite of the high-voltage wire harness. In addition, according to the invention, shielding members may be further provided so that the insulating and waterproofing portions can be covered and shielded with the shielding members. In addition, a protector may be further provided so that the insulating and waterproofing portions covered with the shielding members can be received therein and protected from the outside. Incidentally, it is preferable that the overcurrent cut-off portion is disposed near the branch connection portion. Thus, not to say, those portions can be received collectively in the protector. In addition, when the protector is used, it is a matter of course that the wire harness can be wired easily in spite of existence of a branching part or a part cutting off an overcurrent. The invention is preferably applied to a long wire harness that is, for example, wired through a vehicle underfloor.
According to the first aspect of the invention, a wire harness has a structure in which a branch line is extended from an intermediate of a conductive path, and an overcurrent cut-off portion is disposed in an intermediate of the branch line. Accordingly, the conductive path does not turn back from a harness terminal position but can extend at a required shortest distance. In addition, an overcurrent can be prevented from flowing into a device to be connected to the branch line. Thus, according to the invention, there is an advantage that it is possible to improve workability in connection with devices (accessories) and reduce the cost, and there is another advantage that it is possible to prevent an overcurrent from flowing.
According to the second aspect of the invention, the following advantage can be obtained in addition to the advantages of the first aspect. That is, there is an advantage that it is possible to insulate and waterproof the branch connection portion and the overcurrent cut-off portion.
According to the third aspect of the invention, the following advantage can be obtained in addition to the advantages of the second aspect. That is, there is an advantage that shielding performance can be given to the branch connection portion from which the branch line branching, and the overcurrent cut-off portion.
According to the fourth aspect of the invention, the following advantage can be obtained in addition to the advantages of the third aspect. That is, due to the protector receiving the insulating and waterproofing portions covered with the shielding members, there is an advantage that the wire harness can be easily fixed to a wiring destination through the protector even when the branch line extends from the wire harness or even when the wire harness includes the overcurrent cut-off portion. As a result, there is an advantage that workability in wiring can be improved.
A wire harness has a conductive path to establish electric connection between high-voltage devices. The conductive path serves as a main line. A branch line is connected to the middle of the conductive path serving as the main line. An electric connection part between the main line and the branch line is formed as a branch connection portion. An overcurrent cut-off portion for cutting off an overcurrent is disposed in the middle of the branch line. Insulating and waterproofing portions each serving as an insulating part and a waterproofing part are provided for the overcurrent cut-off portion and the branch connection portion respectively. The overcurrent cut-off portion is disposed near the branch connection portion.
An embodiment will be described below with reference to the drawings.
In the present embodiment, the invention is applied to a wire harness to be wired in a hybrid car (which may be replaced by an electric car or the like).
<About Hybrid Car 1>
In
The motor unit 3 and the inverter unit 4 are connected through a high voltage (i.e. for high voltage application) wire harness 8. In addition, the battery 5 and the inverter unit 4 are also connected through a high voltage wire harness 9. An intermediate portion 10 of the wire harness 9 is wired in an vehicle underfloor 11. In addition, the wire harness 9 is wired substantially in parallel with the vehicle underfloor 11. The vehicle underfloor 11 is a well-known body which is a so-called panel member. Through holes are formed in predetermined positions of the vehicle underfloor 11. The wire harness 9 is watertightly inserted into the through holes.
The wire harness 9 and the battery 5 are connected through a junction block 12 which is provided in the battery 5. An external connection unit such as a shield connector 14 or the like disposed at a rear-end-side harness terminal 13 of the wire harness 9 is electrically connected to the junction block 12. On the other hand, the wire harness 9 and the inverter unit 4 are electrically connected to each other through an external connection unit such as a shield connector 14 or the like disposed at a front-end-side harness terminal 13.
The motor unit 3 has a configuration including a motor and a generator. On the other hand, the inverter unit 4 has a configuration including an inverter and a converter. The motor unit 3 is formed as a motor assembly including a shield case. The inverter unit 4 is also formed as an inverter assembly including a shield case. The battery 5 is a modularized one based on Ni—MH or Li-ion. For example, an electric storage device such as a capacitor may be used. The battery 5 is not limited especially as long as it can be used in the hybrid car 1 or an electric car.
<About Wire Harness 9>
The long wire harness 9 to be wired through the vehicle underfloor 11 has a configuration including a harness body 15, and the shield connectors 14 disposed at the opposite ends of the harness body 15, that is, at the harness terminals 13 respectively. In addition, the wire harness 9 is configured to include a plurality of not-shown fixation members (such as clamps) for wiring the wire harness 9 at a predetermined position, and not-shown water stop members (such as grommets).
<About Harness Body 15>
In
<About Branching/Overcurrent Cut-Off Structure Portion 21>
In
In the branching/overcurrent cut-off structure portion 21, the branching structure portion body 22 serves as a structure portion for branching the two branch lines 23 from the middles of the two conductive paths 16. On the other hand, the overcurrent cut-off structure portion body 24 is disposed in the middles of the two branch lines 23 so as to serve as a structure portion for cutting off an overcurrent. Incidentally, the branch lines 23 in the branching/overcurrent cut-off structure portion 21 are configured to include two branch lines 26 and two branch lines 27.
<About how to Describe Constituent Members>
The aforementioned constituent members of the harness body 15 will be described below. In addition, constituent members of the branching structure portion body 22 and constituent members of the overcurrent cut-off structure portion body 24 will be also described. Incidentally, the description of the branching structure portion body 22 and the overcurrent cut-off structure portion body 24 will be made along their assembling procedure.
Further,
<About Conductive Path 16>
In
The insulator 16b is formed out of a thermoplastic resin material on an outer circumferential surface of the conductor 16a by extrusion molding, as a coating with a circular shape in section. The insulator 16b is formed with a predetermined thickness. Various kinds of well-known resins can be used as the aforementioned thermoplastic resin material. For example, a suitable one is selected from high polymer materials such as polyvinylchloride resin, polyethylene resin, polypropylene resin, etc.
The conductive path 16 configured thus is used as a main line. The reference sign 16c represents a main-line-side conductor exposed portion. The main-line-side conductor exposed portion 16c is formed in such a manner that the insulator 16b in a predetermined intermediate position of the conductive path 16 serving as a main line is removed by suitable length to thereby expose the conductor 16a.
<About Branch Line 26>
In
The insulator 26b is formed out of a thermoplastic resin material on an outer circumferential surface of the conductor 26a by extrusion molding, as a coating with a circular shape in section. The insulator 26b is formed with a predetermined thickness. Various kinds of well-known resins can be used as the aforementioned thermoplastic resin material. For example, a suitable one is selected from high polymer materials such as polyvinylchloride resin, polyethylene resin, polypropylene resin, etc.
The branch line 26 configured thus is used for branching from the middle of the conductive path 16 serving as a main line. The reference sign 26c in the branch line 26 represents a branch-line-side conductor exposed portion. The branch-line-side conductor exposed portion 26c is formed in such a manner that the insulator 26b at one end of the branch line 26 is removed by suitable length to thereby expose the conductor 26a. A terminal fitting 28 and a water stopper 29 are provided on the other end side of the branch line 26. The terminal fitting 28 is a so-called crimp terminal, where a bolt insertion hole is formed in an electric contact portion. A so-called rubber stopper is used as the water stopper 29. The water stopper 29 is one of members constituting an insulating and waterproofing portion 42, which will be described later. Incidentally, the two branch lines 26 are formed so that one of them is a little longer than the other.
<About Branch Connection Portion 30>
In
<About Insulating and Waterproofing Portion 32>
In
<About Cylindrical Braids 17 and 18>
In
A locking collar portion 33a, 34a is formed in the shield shell 33, 34. A lock protrusion 33b, 34b to be locked to the shielding member 35 is formed in the collar portion 33a, 34a (the lock structure is exemplary).
<About Shielding Member 35>
In
When the two insulating and waterproofing portions 32 are covered with the shielding member 35, and when the shield shells 33 and 34 are attached (locked) to the shielding member 35, electromagnetic shielding treatment in the branching part is completed (see
<About Branch Line 27>
In
The insulator 27b and the sheath 27d are formed out of a thermoplastic resin material on the outer circumferential surfaces of the conductor 27a and the braid 27c by extrusion molding as coatings each having a circular shape in section. Each of the insulator 27b and the sheath 27d is formed with a predetermined thickness. Various kinds of well-known resins can be used as the aforementioned thermoplastic resin material. For example, a suitable one is selected from high polymer materials such as polyvinylchloride resin, polyethylene resin, polypropylene resin, etc.
The branch lines 27 configured thus are used for branching from the middles of the conductive paths 16 serving as main lines, in the same manner as the branch lines 26. A terminal fitting 28, a water stopper 29, and a conductive shield terminal 36 are provided on one end side of each branch line 27. The braid 27c is connected to the shield terminal 36 by a suitable method. Incidentally, the two branch lines 27 are formed so that one of them is a little longer than the other. The branch lines 26 and 27 are electrically connected to each other after they are inserted into a fuse box 37.
<About Fuse Box 37>
In
<About Overcurrent Cut-Off Portion 39>
When the branch lines 26 and 27 are completely electrically connected to each other or the branch lines 26 and 27 are completely electrically connected to each other through a fuse 38, an overcurrent cut-off portion 39 is formed as shown in
<About Cover 40>
In
<About Insulating and Waterproofing Portion 42 and Overcurrent Cut-Off Structure Portion Body 24>
In
<About Shielding Member 43>
In
<About Shield Terminal Connection Member 44>
In
When the shield terminal connection member 44 is attached, the braids 27c of the branch lines 27 are electrically connected to the shielding member 43 through the shield terminal connection member 44 and the shield terminal 36. When the metal foil 47 is then attached to cover the branch lines 26 as shown in
<About Protector 25 and not-Shown Protector Cover>
In
<About Summary and Effect of Wire Harness 9>
As has been described with reference to
Therefore, according to the wire harness 9 of the invention, there is an effect that it is possible to improve workability in connection with devices (accessories) and reduce the cost. According to provision of the wire harness 9 of the invention, there is an effect that not only is it possible to establish electric connection between devices (accessories) located at the harness terminals 13 but it is also possible to establish electric connection with another device (accessory), and there is an effect that an overcurrent can be prevented from flowing.
It is a matter of course that various changes can be made on the invention without change the gist of the invention.
Kuboshima, Hidehiko, Ogue, Takeshi, Hironaka, Ryouji
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Feb 24 2017 | Toyota Jidosha Kabushiki Kaisha | (assignment on the face of the patent) | / | |||
Feb 27 2017 | OGUE, TAKESHI | Yazaki Corporation | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 042000 | /0174 | |
Feb 27 2017 | KUBOSHIMA, HIDEHIKO | Yazaki Corporation | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 042000 | /0174 | |
Feb 27 2017 | HIRONAKA, RYOUJI | Yazaki Corporation | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 042000 | /0174 | |
Feb 27 2017 | OGUE, TAKESHI | Toyota Jidosha Kabushiki Kaisha | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 042000 | /0174 | |
Feb 27 2017 | KUBOSHIMA, HIDEHIKO | Toyota Jidosha Kabushiki Kaisha | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 042000 | /0174 | |
Feb 27 2017 | HIRONAKA, RYOUJI | Toyota Jidosha Kabushiki Kaisha | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 042000 | /0174 | |
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